Piston-pump



(No Model.) 2 SheetsSheet '1. 13.1%]. JOHNSON. PISTON PUMP.

Patented June 15,1897.

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Patented June 15, 1897.

NTTED STATES PATENT Fries.

EDXVARD E. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNEASSIGNMENTS, TO THE DEMING COMPANY, OF SALEM, OIIIO.

PISTON-PUMP.

SPECIFICATION forming part of Letters Patent No. 584,592, dated June 15,1897.

Application filed. May 4:, 1896. Serial No. 590,141. (No model.)

To aZZ whom it may concern:

Be it known that I, EDVVARD'E. JOHNSON, of Chicago, county of Cook, andState of Illinois, have invented certain new and useful Improvements inPiston-P umps, of which the following is a specification.

This invention relates to certain details of construction which areparticularly applicable to powerpumps of that class in which thecylinder and cross-head guides are cast integral with each other or areotherwise so connected as to render the parts difficult to assemble orremove when constructed in the ordinary manner, of which class theordinary triplex power-pump is a familiar example.

The invention consists more particularly in an improved form ofconnection between the cross-head and piston-rod, by which said partsmay be more readily disconnected, and in the peculiar construction ofthe cylinderhead, which facilitates the removal of the piston and themore ready access to and packing of the various adjacent parts.

In the accompanying drawings, Figurel is a fragmentary end elevation ofa power-pump constructed in accordance with myinvention.

Fig. 2 is a sectional elevation thereof, taken on line 2 2 of Fig. 1.Fig. 3 is a horizontal section taken on line 3 3 of Fig. 1. Fig. 4 is asectional detail of the cross-head, showing the oil-reservoir therein.Fig. 5 is a perspective detail of the cross-head end of the piston-rod.Figs. 6 and 7 are details of the split clampingcollar for saidpiston-rod end. Fig. 8 is an enlarged top plan view of the inclosin gsleeve for said collar. Fig. 9 is a similar view of the split ring forthe cylinder-head. Fig. 10 is an inner side elevation of one sectionthereof. Fig. 11 is a transverse section of the in ner head. Fig. 12 isa similar View of the outer head, taken on line 12 12 of Fig. 13. Fig.13 is a top plan view thereof. Fig. leis a detail section of a somewhatmodified form of cross-head and piston-rod connection.

I11 said drawings, A designates a cylinder of a pump, and A a standardrising from said cylinder to support the driving shaft and gear. Saidstandard consists of a vertical web a, provided with side flanges a,which widen out at a point about midway of the height of the standard toafford guides a for the cross-head B of the pump.

O designates the piston-rod, to the lower end of which any suitableplunger or piston (not herein shown) is secured. A principal feature ofthe present improvement consists in the mode of connecting saidpiston-rod with the cross-head B, the object of the improvement being toprovideareadily-detachable connection which shall not require a relativerotation of the cross-head and pistonrod in order to separate andattachthem;

To this end the upper extremity of the piston-rod is made in the form ofa truncated cone 0, which joins the body of the rod at its point ofsmallest diameter, leaving a surrounding shoulder c at the point ofjuncture. The said conical end may be either made integral with the roditself or may be made in a separate piece, with a threaded end 0 whichis screwed or otherwise secured within a suitable bore in the end of therod. Being thus formed the extremity of the rod is inserted through anaperture in a rotative sleeve 2) of the cross-head, and its conicalportion is clasped between the two sections of a conically-bored splitcollar 1), that is seated within the upper end of said sleeve. Thelatter is exteriorly screw-threaded and is designed to be seated withina screw-threaded socket b in the lower end of the cross-head B. Thelength of the conical end 0 of the piston rod is somewhat greater thanthe thickness of the split collar 6', so that it projects slightly abovethe upper surface of the latter when the parts are assembled. Thescrewing of the collar 1) into the cross-head, therefore, serves tocarry the upper end surface of the conical terminal 0 into cont-act withthe bottom of the socket 19 and thereby causes said terminal to befirmly seated and held within the conical seat formed by the splitcollar 19'. \Vith this construction the cross-head and. piston-rod maybe disconnected at any time by simply unscrewing the sleeve 19, anysuitable spanner-slots b or similar devices being provided in the sleevefor this purpose. The piston-rod is then free from the cross-head, andthe sleeve and collar may thereupon be removed by simply slipping thesleeve downwardly away from the collar, which in the meantime will beheld up by the shoulder c of the rod. The collar being thus released itshalves may be separated and removed from the conical terminal of therod, and the sleeve 1) may then be lifted off over said terminal, thelarger extremity of the conebeingmade not greater than the maximumdiameter of the rod to permit the application and removal of the sleevein this manner. A reversal of this operation will obviously enable theparts to be reassembled and the piston-rod to be again connected withthe cross-head.

The construction thus described entirely obviates the turning of thepiston-rod or the cross-head incident to the ordinary screwthreadedconnection in the connecting or disconnecting of the parts and thecutting or marring of the piston-rod by the application of a pipe-Wrench in turning it. In deep-well pumps, Artesian engines, &c., wherescrewjoints are used in connecting several sections of the piston-rodtogether, the turning of the rod is also objectionable in being liableto disconnect the parts of the rod itself, and in structures of thiskind the improved connection described is especially advantageous. Itmay also be advantageously used in drilling or other machinery wheresimilar requirements prevail, or in connecting together any two parts towhich it is applicable, since the joint may be made of any desiredstrength and is simple and unlikely to work loose or get out of order.

It will of course be obvious that an effective connection embodying thesame principles of construction may be made in which the end of thepiston-rod is of other than the exact conical shape shown so long as itsform is such as to positively interlock with the correspondingly-shapedbore of the split collar.

For example, in Fig. 14: l have shown a construction in which the end ofthe rod is form ed with annular grooves and ridges 0 which are engagedby coactin g ridges and grooves on the inner surface or bore of a splitcollar b The wedging action by which the piston-rod terminal is tightlygrasped between the sections of the collar may in this case beaccomplished by making the outer surface of said split collar of conicalshape and providing a corresponding conically-shaped socket in therotative sleeve 1). The downward pressure of the crosshead upon the endof the piston-rod will obviously tend to force said rod downwardly withrelation to the sleeve and to carry with it the split collar, so thatthe latter will become more firmly wedged within its seat in said sleeveand will consequently grip the end of the piston-rod with acorrespondingly-increased pressure. Various other modifications to thesame effect will readily suggest themselves to the skilled mechanic, butare all to be understood as included within the spirit of my broadinvention.

A further improvement in the cross-head B contemplates a more effectivelubrication of the beari n g between the connecting-rod D and the pin d,by which it is pivotally secured to said cross-h ead. To this end thelatter is hollowed out in its upper side to provide a cupshaped recess17 into which the lower end of the connecting-rod projects and withinwhich it is secured by the pin (l. Said pin extends transversely acrossthe recess 11 between the side walls b thereof, and is made to have, adriving fit with the latter or is tightlysecured therein in any othersuitable manner. The pitman or connecting-rod D is bored out tooscillate upon the pin (Z, and the bearing thus provided is keptconstantly lubricated by a bath of oil, which is poured into the recessb in sufficient quantities to keep said bearing immersed. The innersurface of the bore which receives the pin d is furthermore groovedlongitudinally at its sides or points of least pressure, as shown at din Figs. 2, 3, and 4, and the oilis conducted thereby throughout thelength of the bearing. Obviously with this construction there will be nopossibility of the bearing wearing or binding for lack of lubricant solong as the recess 17 is filled with oil.

In pumps of the type under consideration the proportions are such thatit is usually incon venient and undesirable to space the cross headguides as widely apart as the diameter of the flange of the cylinderend, since such a construction would involve both a most ungainly designand a great waste of material. It is nevertheless frequently necessaryto re move the cylinder-head in order to give access to the interior ofthe cylinder, and since the cross-head guides arenot far enough apart topermit a cylinder-head of the ordinary construction to pass between theguides and lifted off the piston-rod in the usual manner I have as afurther improvement pro vided a special construction, as follows: Adesignates a cast-iron head made slightly larger in diameter than thebore of the cylinder A, but of less diameter than the distance betweenthe cross-head guides a so that it may be removed through said guideswhen the cross-head is disconnected and out of the way. In this instancethe cross-head and its guides are made of eylindric shape, as clearlyshown in Fig. 3, and are of a diameter slightly greater than thediameter of the head A as above stated. Said head A is provided with acenter aperture for the passage of the piston-rod and with the usualstuffing-box a to prevent leakage around the latter. The head A isseated within a counterbore a which extends into the end A of thecylinder the entire depth of the head. Said counterbore is in thisinstance shown as slightly larger in diameter than the head, except atits lower end, where a ground-joint A is provided. The head is held inplace within the counterbore by means of a split ring A. This ring isprovided with a downwardly-projecting cylindric portion a, which isseated within an annular groove provided by slightly enlarging the upperend of the counterbore at and turning down the opposite margin of thehead, so as to form shoulders a and a be tween which and the lower edgeof the ring a suitable packing a is provided. The ring A is also formedwith an outwardly-projecting flange a having apertures a, through whichbolts (612 are passed into the end of the cylinder to secure the ring inplace. Said holes ca are in this instance shown as six in number and areso placed about the circumference of the ring that two of the holes arelocated on the line of division between the two sections of the ring, sothat a single bolt at this point will engage and bind both sec tions.

W'ith the construction thus described the cylinder'head may be removedat any time after the cross-head is disconnected and out of the way bysimply unbolting and removing the split ring A and then lifting the headvertically upward between the guides 64 so that it clears the piston-rodO. The latter, together with the piston, may then be lifted out of thecylinder and either removed laterally beneath the guides a or upwardlybetween the same, since its diameter is, as before stated, less than thediameter of the cylinder-head, and consequently less than the distancebetween said guides.

The upper end A of the cylinder is herein shown as made as a separatepiece or outer head, which fits within a counterbore a of thecylinder-body and is secured by bolts e placed around its outer edge, asuitable packin g a being inserted between the parts to prevent leakage.Such separable outer head or cylinder'head, however, is simplycharacteristic of the particular style of pump to which my improvementshave in this instance been applied and forms no part of my presentinvention, since it will be obvious that the inner head and split ringcould be applied equally well to an integral cylinder end as to theseparable end illustrated.

I claim as my invention- 1. The combination with a piston-rod andcross-head, of a socket in said cross-head, a recessed sleeve fittingover the piston -rod and adapted to be secured within the cross-headsocket, and a split collar seated within the recessed sleeve andinterlocking with the end of the piston-rod.

2. As a means for connecting a piston-rod and cross-head, a conicalterminal on said of a correspondingly-bored split collar flitting saidterminal and made of less depth than the length thereof, a sleevefitting over said piston-rod and collar, and a cross-head having ascrew-threaded recess to receive said sleeve, substantially asdescribed.

4. A power pump provided with one or more cylinders, shaft-supportingstandards arising above said cylinders, cross-head guides on saidstandards more widely separated than the cylinder-bore, a cylinder-headof a diameter less than the distance between the crosshead guideswhereby it may be removed through the same and a split clamping-ringbolted to the end of the cylinder and engaging the head to hold the samein place, a conical terminal on the piston-rod, a correspondingly-boredsplit collar fitting said terminal and a recessed sleeve inclosing thecollar and secured within a socket on the cross-head, substantially asdescribed.

5. The combination with the cylinder and cross-head guides, of the innercylinder-head of less diameter than the distance between the cross-headguides, the outer cylinderhead bolted to the cylinder, and a splitclamping-ring bolted to the outer cylinder-head and engaging the innercylinder-head to hold the latter in place substantially as described.

6. The combination with the cylinder and cross-head guides of the outercylinder-head fitting within the counterbored end of the cylinder andbolted to the latter, the inner cylinder-head of less diameter than thedis tance between the cross-head guides fitting within a counterbore inthe outer cylinderhead and a split ring bolted to the outercylinder-head and engaging the inner cylinderhead to hold the latter inplace substantially as described.

In testimony that I claim the foregoing as my invention I afiiX mysignature, in the presence of two witnesses, this 30th day of April, A.D. 1896.

EDWARD E. JOHNSON.

Witnesses:

HENRY W. CARTER, WILLIS D. SHAFER.

